diff --git a/source/build/include/polymost.h b/source/build/include/polymost.h
index 0f5dd5232..298108b1e 100644
--- a/source/build/include/polymost.h
+++ b/source/build/include/polymost.h
@@ -46,7 +46,7 @@ void polymost_drawrooms(void);
 void polymost_resetVertexPointers(void);
 void polymost_disableProgram(void);
 void polymost_resetProgram(void);
-void polymost_setTexturePosSize(vec4f_t texturePosSize);
+void polymost_setTexturePosSize(vec4f_t const &texturePosSize);
 void polymost_setFogEnabled(char fogEnabled);
 void polymost_useColorOnly(char useColorOnly);
 void polymost_usePaletteIndexing(char usePaletteIndexing);
diff --git a/source/build/src/polymost.cpp b/source/build/src/polymost.cpp
index d95bc9752..afd38c208 100644
--- a/source/build/src/polymost.cpp
+++ b/source/build/src/polymost.cpp
@@ -614,7 +614,7 @@ static void polymost_setCurrentShaderProgram(uint32_t programID)
     glUniform1f(polymost1UseGlowMappingLoc, polymost1UseGlowMapping);
 }
 
-void polymost_setTexturePosSize(vec4f_t texturePosSize)
+void polymost_setTexturePosSize(vec4f_t const &texturePosSize)
 {
     if (currentShaderProgramID == polymost1CurrentShaderProgramID)
     {
@@ -623,7 +623,7 @@ void polymost_setTexturePosSize(vec4f_t texturePosSize)
     }
 }
 
-static void polymost_setHalfTexelSize(vec2f_t halfTexelSize)
+static inline void polymost_setHalfTexelSize(vec2f_t const &halfTexelSize)
 {
     if (currentShaderProgramID == polymost1CurrentShaderProgramID)
     {